Zobrazeno 1 - 10
of 12
pro vyhledávání: '"George E. Hassel"'
Publikováno v:
Physical Review Physics Education Research, Vol 13, Iss 2, p 020121 (2017)
We present the Electricity and Magnetism Conceptual Assessment (EMCA), a new assessment aligned with second-semester introductory physics courses. Topics covered include electrostatics, electric fields, circuits, magnetism, and induction. We have two
Externí odkaz:
https://doaj.org/article/66d258a77e774b8f8fdf4031e23ffb77
Publikováno v:
The Astrophysical Journal. 681:1385-1395
Sakai et al. have observed long-chain unsaturated hydrocarbons and cyanopolyynes in the low-mass star-forming region L1527, and have attributed this result to a gas-phase ion-molecule chemistry, termed ``Warm Carbon Chain Chemistry'', which occurs du
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b4d5011c36375ca648feeb28dbb406a
https://doi.org/10.1086/588185
https://doi.org/10.1086/588185
Autor:
P. Hily-Blant, A. O. H. Olofsson, Friedrich Wyrowski, Alexandre Faure, E. Herbst, George E. Hassel, Maryvonne Gerin, Carina M. Persson, D. C. Lis, R. Le Gal, Michael Olberg, John H. Black, Eva Wirström
We have used the Herschel-HIFI instrument to observe both nuclear spin symmetries of amidogen (NH2) towards the high-mass star-forming regions W31C (G10.6-0.4), W49N (G43.2-0.1), W51 (G49.5-0.4) and G34.3+0.1. The aim is to investigate the ratio of n
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d96284701087fe99fcccdb75dea4c231
http://arxiv.org/abs/1511.05486
http://arxiv.org/abs/1511.05486
Autor:
E. Herbst, Michael Olberg, A. O. H. Olofsson, Eva Wirström, George E. Hassel, Herma M. Cuppen, John H. Black, Karl M. Menten, Åke Hjalmarson, M. Hajigholi, Carina M. Persson, D. C. Lis, Maryvonne Gerin, José Cernicharo, Holger S. P. Müller
Publikováno v:
Astronomy & Astrophysics, 567
The understanding of interstellar nitrogen chemistry has improved significantly with recent results from the Herschel Space Observatory. To set even better constraints, we report here on deep searches for the NH+ ground state rotational transition J=
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0da01528ff683f97b04b457abfa7f455
http://arxiv.org/abs/1407.1823
http://arxiv.org/abs/1407.1823
Autor:
Charlotte Vastel, Carina M. Persson, Paul F. Goldsmith, Juergen Stutzki, Thomas F. Giesen, Maryvonne Gerin, John H. Black, Bhaswati Mookerjea, George E. Hassel, T. Harrison, Jérôme Pety
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2014, 566, pp.A61. ⟨10.1051/0004-6361/201323131⟩
Astronomy and Astrophysics-A&A, 2014, 566, pp.A61. ⟨10.1051/0004-6361/201323131⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2014, 566, pp.A61. ⟨10.1051/0004-6361/201323131⟩
Astronomy and Astrophysics-A&A, 2014, 566, pp.A61. ⟨10.1051/0004-6361/201323131⟩
In the framework of the Herschel/PRISMAS Guaranteed Time Key Program, the line of sight to the distant ultracompact HII region W51e2 has been observed using several selected molecular species. Most of the detected absorption features are not associat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45230be95cf2ca558c69ca19d5d70114
Autor:
John H. Black, John C. Pearson, Shanshan Yu, B. Godard, M. De Luca, Audrey Coutens, Maryvonne Gerin, Holger S. P. Müller, Bhaswati Mookerjea, Carina M. Persson, Javier R. Goicoechea, George E. Hassel, E. Herbst, Pierre Hily-Blant, A. O. H. Olofsson, Tom Bell, Karl M. Menten
We have used the Herschel-HIFI instrument to observe interstellar nitrogen hydrides along the sight-lines towards W49N and G10.6-0.4 in order to elucidate the production pathways leading to nitrogen-bearing species in diffuse gas. All detections show
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e7b49f7b542c48992f0ec7ab48203d07
Autor:
D. Teyssier, Dariusz C. Lis, Thomas F. Giesen, N. Honingh, Robert Kołos, Maryvonne Gerin, Javier R. Goicoechea, Emmanuel Caux, Rene Plume, Jesús Martín-Pintado, Carina M. Persson, T. Klein, C. Joblin, Bhaswati Mookerjea, Paule Sonnentrucker, M. De Luca, John Ward, R. Güsten, W. A. Hatch, Benjamin Godard, Pierre Hily-Blant, J. Stutzki, José Cernicharo, Harshal Gupta, John H. Black, Thomas R. Geballe, Emmanuel Dartois, Patrick W. Morris, Charlotte Vastel, Thomas G. Phillips, M. Imram, F. Boulanger, Pieter Dieleman, A. Contursi, Tom Bell, Paul F. Goldsmith, David A. Neufeld, Eric Herbst, Jacek Krełowski, Shanshan Yu, M. Salez, Rudolf Schieder, Audrey Coutens, Pierre Encrenaz, M. Perault, Stephan Schlemmer, Paul B. Rimmer, George E. Hassel, Cecile Gry, E. Falgarone, J. C. Pearson, Patrick Hennebelle, M. R. Schmidt, Raquel Monje, Jonas Zmuidzinas, Karl M. Menten, Pieter R. Roelfsema, M. Kaźmierczak
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2010, 521, pp.L16
Astronomy and astrophysics, 521:L16. EDP Sciences
Astronomy and Astrophysics-A&A, EDP Sciences, 2010, 521, pp.L16
Astronomy and astrophysics, 521:L16. EDP Sciences
We report the detection of the ground state N,J = 1,3/2 → 1,1/2 doublet of the methylidyne radical CH at ~532 GHz and ~536 GHz with the Herschel/HIFI instrument along the sight-line to the massive star-forming regions G10.6-0.4 (W31C), W49N, and W5
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c472edb3427debc2c727b6492827767
http://adsabs.harvard.edu/abs/2010A&A...521L..16G
http://adsabs.harvard.edu/abs/2010A&A...521L..16G
Autor:
Pascal Honvault, Daiqian Xie, Tom J. Millar, George E. Hassel, Donghui Quan, Hua Guo, Eric Herbst, Shi Ying Lin
Publikováno v:
Quan, D, Herbst, E, Millar, TJ, Hassel, G E, Lin, S Y, Guo, H, Honvault, P & Xie, D 2008, ' New Theoretical Results Concerning the Interstellar Abundance of Molecular Oxygen ' Astrophysical Journal, vol. 681, no. 2, pp. 1318-1326 . DOI: 10.1086/588007
The low abundance of molecular oxygen in cold cores of interstellar clouds poses a continuing problem to modelers of the chemistry of these regions. In chemical models O2 is formed principally by the reaction between O and OH, which has been studied
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b8ca10f7829e9d6376ee773b460837e
https://pure.qub.ac.uk/ws/files/479732/apj_681_1318.pdf
https://pure.qub.ac.uk/ws/files/479732/apj_681_1318.pdf
Autor:
Eric Herbst, Dana E. Anderson, Geoffrey A. Blake, Cécile Favre, Nathan R. Crockett, Justin L. Neill, George E. Hassel, Edwin A. Bergin
Publikováno v:
The Astrophysical Journal. 806:239
We present chemical implications arising from spectral models fit to the Herschel/HIFI spectral survey toward the Orion Kleinmann-Low nebula (Orion KL). We focus our discussion on the eight complex organics detected within the HIFI survey utilizing a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d4496e36eed2eb85bd1f92d0c68e7af5
https://doi.org/10.1088/0004-637x/806/2/239
https://doi.org/10.1088/0004-637x/806/2/239
Publikováno v:
The Astrophysical Journal. 743:182
In previous warm-up chemical models of the low-mass star-forming region L1527, we investigated the evolution of carbon-chain unsaturated hydrocarbon species when the envelope temperature is slightly elevated to $T\approx 30$ K. These models demonstra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1bb93f3b963a61a4e4a3ad57ac7d1f8c
https://doi.org/10.1088/0004-637x/743/2/182
https://doi.org/10.1088/0004-637x/743/2/182